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buffer_forwarder.go
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/
buffer_forwarder.go
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// Copyright 2023, Shulhan <ms@kilabit.info>. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package telemetry
import (
"bytes"
"fmt"
"sync"
)
// BufferForwarder write the metrics to underlying [bytes.Buffer].
type BufferForwarder struct {
formatter Formatter
bb bytes.Buffer
sync.Mutex
}
// NewBufferForwarder create new BufferForwarder using f as Formatter.
func NewBufferForwarder(f Formatter) *BufferForwarder {
return &BufferForwarder{
formatter: f,
}
}
// Bytes return the metrics that has been written to Buffer.
// Once this method called the underlying Buffer will be resetted.
func (buf *BufferForwarder) Bytes() (b []byte) {
buf.Lock()
b = buf.bb.Bytes()
buf.bb.Reset()
buf.Unlock()
return b
}
// Close on Buffer is a no-op.
func (buf *BufferForwarder) Close() error {
return nil
}
// Formatter return the Formatter used by this BufferForwarder.
func (buf *BufferForwarder) Formatter() Formatter {
return buf.formatter
}
// Write the raw metrics to Buffer.
func (buf *BufferForwarder) Write(wire []byte) (n int, err error) {
buf.Lock()
defer buf.Unlock()
n, err = buf.bb.Write(wire)
if err != nil {
return n, fmt.Errorf(`BufferForwarder.Forward: %w`, err)
}
return n, nil
}